题目内容
（请给出正确答案）
Studying dead tree rings shows______.
A．where the people had to go
B．what the people had to eat
C．how the people left
D．why people had to leave
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更多“Studying dead tree rings shows…”相关的问题
The scientists are interested in studying tree rings because they can tell______.
A．whether in that area the climate was healthy or not
B．whether a particular tree was healthy or not
C．whether people, took good care of the trees or not
D．how old the trees were
Trees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.
First, pruning may be done to make sure that trees have a desired shape. The object may be to get a tree of the right height, and to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. A tree may grow healthier by removing the branches that are locking up the centre and so preventing the free movement of air.
One result of pruning is that an open wound is left on the tree and this provides an easy entry (进入) for diseases, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die. Pruning is usually clone in winter, for then you can see the shape of the tree clearly without the interference from the leaves.
According to the article, which of the following statement is NOT true？
A．Pruning is necessary when there are unwanted branches.
B．Damage is done to a tree if it is left to grow in its own way.
C．Diseased or dead branches should be cut away if they are found to rub against each other.
D．Growing side branches often prevent air from moving freely.
Flying foxes have babies once a year, giving birth to only one at a time. At first the mother has to carry the baby on her breast wherever she goes. Later she leaves it hanging up, and brings back food for it to eat. Sometimes a baby falls down to the ground and squeaks(尖叫) for help. Then the older ones swoop (俯冲) down and try to pick it up. If they fail to do so, it will die, Often hundreds of dead baby bats can be found lying on the ground at the foot of a tree.
The passage tells us that there is no difference between, the flying fox and the ordinary hat in ______. ()
A．their size
B．their appearance
C．the way they rest
D．the kind of food they eat
Electronic brains can reduce the profusion of dead ends______(involve)in vital research.
How many students were shot dead in 1997 in US schools？
A. 10
B. 9
C. 12
D. 22
Which of the following usually causes a tree to grow unhealthy？
A. Giving a tree a special shape and a definite height.
B. Removing small side branches and making a tree look less thick.
C. Allowing too many branches to grow in the middle.
D. Having a tree surrounded by many other trees.
The soldier from a wound and died a heroic .
A.died …deadly…death
B.was dead…dying…death
C.died…dead…dying
D.was dying…dead…death
He climbed up into the tree and picked all of the fruit ______ reach.
A．near
B．inside
C．within
D．beyond
